Thermostatic electric switch.



F. KuHN 1. A. HAND. THERMOSTATIC ELECTRIC SWITCH. APPLICATION FllD MH. IB. |911.

1 ,263,568. l Patented Apr. 23, 1918.

an Z13/#ra di/2. Z472 ci @a1/mmh #um www aucun/lts UNITED STATES PATENT OFFICE.

FRANK KUHN ANI) JAY A. HAND, OF- DETROIT, MICHIGAN, ASSIGNORS TO AMERICAN ELECTRICAL HEATER COMPANY, F DETROIT, MICHIGAN, A CORPORATION 0F MICHIGAN.

` -To au whom, 'it may concern.'

"Be it known that. we, FRANK KUHN and JAY A, HAND, both citizens of the United States of America, residing at. Detroit, i n the' county of 1Wayne and Stute of Michifgan, have invented certain new and useful A'Improvements '.-fparticularly designed for use in cun'iection with electrically heated warmingpads, and it is the object of the invention to obtain (a simple construction for manufacture and one which is easilyr adjusted and maintaine Vin operative condition.

In the drawings:

:Figure 1 is an enlarged .longitudinalsection through the thermostat;

f-Fig; 2 is a perspective view lofthe' parts detached.

@-Fig. 3 is a perspective view of the thermostatwhen detached fr'om the casing.

A is a fiat metallic strip; having placed upon opposite sides thereofrfacings and B of insulating material, preferably of mica. C aud C' are composite strips or thermostatic liars which are secured on opposite. sides of the har A `by suitable means, such as the rivets D. passingfthroiigh apertnresiE in the bar A. .The arrangement is i -sides of said supporting bar, secured thereto 4suchthat each ot' thefstrps C and C' is insulated and is at the saine time securely attached at one end tothe bar .F isfan adjusting screughaving a .threaded engageme nt..with one of thc thermostatic bars C and passing through an aperture G inA the bar A ,and insulating facings into contact with `the other of `the thermostatic bars.

yNon-corrodiblcpoints of platinum` orother suitable.materialen-e placed upon ,the adjusting scrcw- F and theother thermostutic Ebar, as indicated at I and;'1., J is a section oftubing forming inhousing foiLthe-thermostat, being,r of an internaldiameter-.cor- `respondiup,r to thc width ofthebai-A wherer 1 by the Alatter is. supported longitudinally centrally of the former and the thermostantic bars are prevented' from engaging the casing. The length ofthis tubular casing is such as to inclose the n'iovable portions of the thermostaiic bars, but a shank4 portion of each of thesebars preferably extends befIHEBMCSTATIC ELECTRIC SWITCH.

Patented Apr. 23, 1918.

Application tiled January '18, 1917. Serial No. 143,157.

yond the casing and is provided with a screw Ix or other means ot' attaching the resistor terminal thereto. The rasiingY .l is

also provided with an aperture L havinr flange or nipple M surrounding the saine.

struction"is ex'ceedingy simple and inoxpensive to manufacture.

'hat we claim as our invention is:

1. A thermostatic electric switch. comprising a flat supporting bar having insulating .fcings ou opposite sides thereof, apair of thermostatic bars on opposite sides of thc supportingr bar. secured thereto and insulated therefrom by said facings, and cooperatingcontacts on the adjarcnt ends of said thermostatic bars cngageable with each other through an aperture in said supporting bar.

A thermostatir electric switch. compris- .ing a liat metallic,supporting har, insulating :faciugs on opposite sides of said bar, [lut thcriiiostatic bars mounted upon opposite and insulated therefrom and havingr their Ainner ends overlapping, and a contact inember adjustubly secured to one of said thermostatu bars, extending through an aper- .turc in theV su ortinlf bar and insulatinu' v P* h facings into engagement with the opposite thermostatic bar.

3. A thcrmostatic electric switch, compris- 4iup; a Hat metallic supportingbar. insulating faciugson opposite sides thereof. flat therinostatic bars secured to aud insulated from opposite ends of said supporting` barLthe ilmcrends-of said thermostatic bars overlapping, an adjustable contact Amember on one bf .said thermostatic bars` passing through un aperture in saidsupportiug bar into engagement with the other of said thermostatic bars. and a cylindrical casing of a diameter' correspondingr to the width of said supporting bar, inclosing thi` same and the thermostatic bars.

4. A thermostatic electric switch, comprising el.` tubular casing, a flat bar of e Width corresponding to the internal diameter of said tubing and extending longitudinally therethrough, and thermostatic hars mounted on said supporting bnr housed within said tubing und adapted to engage each other.

5. In a thermostutic electric switch, a tubular housing, a Hat metallic bar of a width corresponding to the internal diameter of said housing, extendimr longitudinally ccntrally therethrough, tiermostatic hars secured to and insulated from said supportingr bar on opposite sides thereof, and :in djustable contact member insertible through an aperture in said tubular housing into enga ement with one of snid thermostatic bars an passing through an aperture in said supporting bar into engagement with the opposite thermostutic bar.

6. A thermostnticelectric switch, comprising/:1 tubular casing, a bar of a width correspending the internal diameter of said tubing and extending longitudinali)r thereof, a thermostetie har mounted on -ssud bar at one side thereof, a second bar mounted on said first mentioned bnr at the opposite side thereof and contactsl on said hars adapted to engage each other.

7. A thermostatic electric switch, comprising a tubular casing, n Hat har ot' a width corresponding to the internal diameter of said tubing and extending longitudinally thereof, a thermostatic bar mounted on said flat. bar :lt one side thereof, a second har mounted on Suid flat bar at the opposite side thereof, an adjustable contact on one of said hars, adjustable from without said tubular casing.

In testimony whereof we uiix our signutures in presence of two witnesses.

FRANK KUHN` JAY A. HAND.

Witnesses HARRY W. Luroxx, Anemia OAKES. 

